Disable nagle algorithm

We want to stream frames out as soon as possible. The nagle algorithm tries to batch together small packets, which is a good idea for throughput but a terrible idea for latency and jitter performance.
Decrease FPS target from 45 to 30

If we leave a little spare CPU, that gives us more control over scheduling. Other tasks will tend to run while we're sleeping, instead of randomly interrupting us. This seems to decrease jitter between frames.
Disable FPS logging by default

Both for performance and chattiness reasons.
Merge branch 'master' of github.com:ArdentHeavyIndustries/amcp-rpi